/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.util.internal.logging;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.helpers.NOPLoggerFactory;
import org.slf4j.spi.LocationAwareLogger;

/**
 * Logger factory which creates a <a href="http://www.slf4j.org/">SLF4J</a> logger.
 */
public class Slf4JLoggerFactory extends InternalLoggerFactory {

  @SuppressWarnings("deprecation")
  public static final InternalLoggerFactory INSTANCE = new Slf4JLoggerFactory();

  /**
   * @deprecated Use {@link #INSTANCE} instead.
   */
  @Deprecated
  public Slf4JLoggerFactory() {
  }

  Slf4JLoggerFactory(boolean failIfNOP) {
    assert failIfNOP; // Should be always called with true.
    if (LoggerFactory.getILoggerFactory() instanceof NOPLoggerFactory) {
      throw new NoClassDefFoundError("NOPLoggerFactory not supported");
    }
  }

  @Override
  public InternalLogger newInstance(String name) {
    return wrapLogger(LoggerFactory.getLogger(name));
  }

  // package-private for testing.
  static InternalLogger wrapLogger(Logger logger) {
    return logger instanceof LocationAwareLogger ?
        new LocationAwareSlf4JLogger((LocationAwareLogger) logger) : new Slf4JLogger(logger);
  }
}
